海上薄互层油田层系重组定量方法研究  

Study on quantitative way for recombination of series of strata of reservoir in offshore with thin interbed

作　　者：向红 唐海[1] 苏彦春 张章 吕栋梁[1] Xiang Hong;Tang Hai;Su Yanchun;Zhang Zhang;Lyu Dongliang(College of Petroleum Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Tianjin Branch Company of CNOOC Ltd.,Tianjin 300452,China)

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《油气藏评价与开发》2018年第5期1-7,共7页Petroleum Reservoir Evaluation and Development

基　　金：国家科技重大专项"复杂河流相油田分层系调整效果评价研究"(2016ZX05058-001-006)

摘　　要：PL油田属于典型的海上薄互层油藏,具有纵向跨度大,薄层占比大等特点。在开发过程中由于前期采用大段合采,层间干扰严重,导致纵向均衡动用程度差,整体开发效果差,为了改善油田开发效果,有必要重组开发层系。首先建立了层系重组有效性判断数学模型,针对PL油田的特点,运用数值模拟建立机理模型,得出油价与调整井平均单井累产油量图版以及目前油价和原始地层条件下层系调整最小油层厚度关系图版;并利用数值模拟开展油藏开发阶段、净毛比、流度级差对层系最小厚度影响的校正曲线研究,建立了层系厚度下限公式,应用在PL油田可使采收率提高6.1%。提出的这套全新的层系重组定量方法的思路,对PL油田及类似油田的高效开发具有指导作用。PL oilfield,which belongs to the offshore reservoirs with thin interbeds,has long treatment interval and high thin layers.During the development,due to the serious interlaminar interference caused by the commingling production and serious interlayer interference in the earlier stage,the vertical balance level and the overall development effect are poor.In order to improve the oilfield development effects,it is necessary to reorganize the development layer.Firstly,we established the mathematic model of effective judgment of combination series of strata.Then,the chart boards of the relation between the oil price and average accumulative production of single adjustment well,and the relation between the current oil price and the thickness of the minimum layers adjusted by the original oil saturation were established by means of numerical simulation which was based on the characteristics of PL oilfield.Meanwhile,the equation of lower thickness limit of layers was acquired based on the research of correction curve of the influence of development stage,net/gross ratio and mobility difference on the minimum thickness of layers.The application in PL oilfield can make the recovery increased by 6.1%.This new quantitative way for recombination of series of strata proposed can guide the efficient development of PL oilfield and similar oilfields.

关 键 词：薄互层 大跨度 层系重组 厚度界限 定量方法 

分 类 号：TE325[石油与天然气工程—油气田开发工程]